Sonys Press conference from MWC took place end of February
If you missed it you can watch it here.
Please join the discussion here and share your thoughts on what was anounced here.
MWC 2019 discussion.
I have translated your question to English as this is an International forum.
If you need to replace the battery in your Xperia Z2 tablet, I would recommend that you get in touch with your Local support team so they can arrange a repair for you, or give you the address to the nearest authorized service centre in your area.